*To*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Subject*: Re: [TCML] JAVATC VTTC design question*From*: Chris Reeland <chrisreeland@xxxxxxxxx>*Date*: Wed, 29 Nov 2017 18:12:04 -0600*Delivered-to*: teslaarchive@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=NESjl2IhsjkahjNQXEnY5UUbNBD/fNJ13vMUQMrqaH8=; b=opcYkptiuTuHJdAarYY4lyCndPwGhZ/14lRZ6EBf2Q6TZWVj8RL9SmseAk3UWMac5M xsZXWC2V4ko4LuhdBjPVlFGVZ2HUaUExzAttiNOswMekCJj+7K2GHYAcj44qxq9PfzqS Ze8aO2nF1pFSewKGrNZXMLVxPrPJxRA0/CIsnx7o5mCbzraPmSGGq0sN354rj2DzCiUg +qVXyuksmt4XkWjUU2Q5Ny4WKR7m/bzJJooYbY6vOIiy3kClztO7lHu4/xA+xrO47Y6F ICGr5K/AEcxNMhgWPG8IHVX3n7BJanycFnTOWOcGxyJDHHAmsCefmTJ1DUUZYajXmlWL xEDA==*In-reply-to*: <1549198631.404733971.1511975756782.JavaMail.zimbra@mchsi.com>*List-archive*: <https://www.pupman.com/pipermail/tesla/>*List-help*: <mailto:tesla-request@tedward.pupman.com?subject=help>*List-id*: Tesla Coil Mailing List <tesla.tedward.pupman.com>*List-post*: <mailto:tesla@tedward.pupman.com>*List-subscribe*: <https://www.pupman.com/mailman/listinfo/tesla>, <mailto:tesla-request@tedward.pupman.com?subject=subscribe>*List-unsubscribe*: <https://www.pupman.com/mailman/options/tesla>, <mailto:tesla-request@tedward.pupman.com?subject=unsubscribe>*References*: <1002799626.404727731.1511975655672.JavaMail.zimbra@mchsi.com> <1549198631.404733971.1511975756782.JavaMail.zimbra@mchsi.com>*Reply-to*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Sender*: "Tesla" <tesla-bounces@xxxxxxxxxx>

Hi Steve, I'm no expert, but familiar some on tube coils. Yes spacing is Okay. I feel it helps. I have done this on a much smaller coil with success. 1/4" for me if I remember correctly. Covers approximately 3/4 of secondary. Increases coupling further I feel on already a lot on tube coils which is normal, because of smooth oscillations you can do this. I have not looked at all numbers yet, but are your input voltages correct? Are you gonna pulse? If so they can be higher within limits. Not sure that tube can handle that voltage, because of ceramic support structure it has inside, if I remember correctly that it has ceramic. And if it did you are just right about there for soft x-rays starting. Again just some thoughts. I'm sure some others will confirm or correct me. Chris Sent from my CAT S60 phone On Nov 29, 2017 3:59 PM, "Steve White" <steve.white1@xxxxxxxxx> wrote: > I am currently building a single 833A-based VTTC based on Steve Ward's > schematic. I was using JavaTC today to design the primary and secondary > coils of my VTTC. Everything looks OK with one possible exception. The > primary design says that the edge-to-edge spacing between turns should be > 0.126 inches and the total primary winding height should be about 5.5 > inches with 26 turns. My question involves the spacing between the primary > turns. JavaTC says 0.126 inches. All of the pictures that I have seen of > VTTCs seems to show tightly wound primaries with no space between them > other than that afforded by the insulation. Does this seem right? I am > including the JavaTC design output below for reference. Ignore the > transformer section. > > J A V A T C version 13.2 - CONSOLIDATED OUTPUT > 11/28/2017, 4:43:37 PM > > Units = Inches > Ambient Temp = 68°F > > ---------------------------------------------------- > Surrounding Inputs: > ---------------------------------------------------- > 0 = Ground Plane Radius > 0 = Wall Radius > 0 = Ceiling Height > > ---------------------------------------------------- > Secondary Coil Inputs: > ---------------------------------------------------- > Current Profile = G.PROFILE_LOADED > 1.75 = Radius 1 > 1.75 = Radius 2 > 10 = Height 1 > 27 = Height 2 > 1005 = Turns > 0.0169 = Wire Diameter > > ---------------------------------------------------- > Primary Coil Inputs: > ---------------------------------------------------- > Round Primary Conductor > 3.313 = Radius 1 > 3.313 = Radius 2 > 10 = Height 1 > 15.427 = Height 2 > 26.1899 = Turns > 12 = Wire Awg > 0 = Ribbon Width > 0 = Ribbon Thickness > 0.002 = Primary Cap (uF) > 0 = Total Lead Length > 0 = Lead Diameter > > ---------------------------------------------------- > Top Load Inputs: > ---------------------------------------------------- > Toroid #1: minor=1.25, major=6.5, height=30, topload > > ---------------------------------------------------- > Secondary Outputs: > ---------------------------------------------------- > 377.92 kHz = Secondary Resonant Frequency > 90 deg° = Angle of Secondary > 17 inch = Length of Winding > 59.1 inch = Turns Per Unit > 0.00002 inch = Space Between Turns (edge to edge) > 920.9 ft = Length of Wire > 4.86:1 = H/D Aspect Ratio > 33.1652 Ohms = DC Resistance > 30000 Ohms = Reactance at Resonance > 0.8 lbs = Weight of Wire > 12.634 mH = Les-Effective Series Inductance > 16.232 mH = Lee-Equivalent Energy Inductance > 16.804 mH = Ldc-Low Frequency Inductance > 14.038 pF = Ces-Effective Shunt Capacitance > 10.926 pF = Cee-Equivalent Energy Capacitance > 28.516 pF = Cdc-Low Frequency Capacitance > 4.5 mils = Skin Depth > 5.013 pF = Topload Effective Capacitance > 133.5963 Ohms = Effective AC Resistance > 225 = Q > > ---------------------------------------------------- > Primary Outputs: > ---------------------------------------------------- > 377.91 kHz = Primary Resonant Frequency > 0 % = Percent Detuned > 90 deg° = Angle of Primary > 45.43 ft = Length of Wire > 72.15 mOhms = DC Resistance > 0.126 inch = Average spacing between turns (edge to edge) > 1.514 inch = Proximity between coils > 1.46 inch = Recommended minimum proximity between coils > 88.921 µH = Ldc-Low Frequency Inductance > 0.002 µF = Cap size needed with Primary L (reference) > 0 µH = Lead Length Inductance > 369.319 µH = Lm-Mutual Inductance > 0.302 k = Coupling Coefficient > 0.128 k = Recommended Coupling Coefficient > 3.31 = Number of half cycles for energy transfer at K > 4.13 µs = Time for total energy transfer (ideal quench time) > > ---------------------------------------------------- > Transformer Inputs: > ---------------------------------------------------- > 240 [volts] = Transformer Rated Input Voltage > 14400 [volts] = Transformer Rated Output Voltage > 690 [mA] = Transformer Rated Output Current > 60 [Hz] = Mains Frequency > 240 [volts] = Transformer Applied Voltage > 20 [amps] = Transformer Ballast Current > > ---------------------------------------------------- > Transformer Outputs: > ---------------------------------------------------- > 9936 [volt*amps] = Rated Transformer VA > 20870 [ohms] = Transformer Impedence > 14400 [rms volts] = Effective Output Voltage > 20 [rms amps] = Effective Transformer Primary Current > 0.3333 [rms amps] = Effective Transformer Secondary Current > 4800 [volt*amps] = Effective Input VA > 0.1271 [uF] = Resonant Cap Size > 0.1907 [uF] = Static gap LTR Cap Size > 0.3314 [uF] = SRSG LTR Cap Size > 458 [uF] = Power Factor Cap Size > 20365 [peak volts] = Voltage Across Cap > 50912 [peak volts] = Recommended Cap Voltage Rating > 0.41 [joules] = Primary Cap Energy > 96.7 [peak amps] = Primary Instantaneous Current > 100.1 [inch] = Spark Length (JF equation using Resonance Research Corp. > factors) > 0 [peak amps] = Sec Base Current > > ---------------------------------------------------- > Rotary Spark Gap Inputs: > ---------------------------------------------------- > 1 = Number of Stationary Gaps > 4 = Number of Rotating Electrodes > 3600 [rpm] = Disc RPM > 0.125 = Rotating Electrode Diameter > 0.1563 = Stationary Electrode Diameter > 9.5 = Rotating Path Diameter > > ---------------------------------------------------- > Rotary Spark Gap Outputs: > ---------------------------------------------------- > 4 = Presentations Per Revolution > 240 [BPS] = Breaks Per Second > 101.7 [mph] = Rotational Speed > 4.17 [ms] = RSG Firing Rate > 0.432 [ms] = Time for Capacitor to Fully Charge > 5 = Time Constant at Gap Conduction > 157.09 [µs] = Electrode Mechanical Dwell Time > 100 [%] = Percent Cp Charged When Gap Fires > 20365 [peak volts] = Effective Cap Voltage > 0.41 [joules] = Effective Cap Energy > 275530 [peak volts] = Terminal Voltage > 100 [power] = Energy Across Gap > 77.7 [inch] = RSG Spark Length (using energy equation) > > ---------------------------------------------------- > Static Spark Gap Inputs: > ---------------------------------------------------- > 0 = Number of Electrodes > 0 [inch] = Electrode Diameter > 0 [inch] = Total Gap Spacing > > ---------------------------------------------------- > Static Spark Gap Outputs: > ---------------------------------------------------- > 0 [inch] = Gap Spacing Between Each Electrode > 0 [peak volts] = Charging Voltage > 0 [peak volts] = Arc Voltage > 0 [volts] = Voltage Gradient at Electrode > 0 [volts/inch] = Arc Voltage per unit > 0 [%] = Percent Cp Charged When Gap Fires > 0 [ms] = Time To Arc Voltage > 0 [BPS] = Breaks Per Second > 0 [joules] = Effective Cap Energy > 0 [peak volts] = Terminal Voltage > 0 [power] = Energy Across Gap > 0 [inch] = Static Gap Spark Length (using energy equation) > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxxxxxxxxxx > https://www.pupman.com/mailman/listinfo/tesla > _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla

**References**:**[TCML] JAVATC VTTC design question***From:*Steve White

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